Beiträge zur Chemie der Pyrrolpigmente, 1. Mitt.: Der induzierte Circulardichroismus einiger Pyrromethenderivate in cholesterischer Mesophase

摘要

The electron absorption spectra of some symmetrically substituted alkyl-dipyrromethene derivatives were analyzed by means of a liquid-crystal-induced circular dichroism technique. The “main band” (440 nm) was found to be polarized parallel, whereas all short-wavelength bands (including one hidden by the main band) are polarized perpendicular to the “long” axis of the m